Satsuki? The mangaka, Kawashita-sensei had made a ''special, short ending'' for her. Only in Satsuki's imagination though. Poor girl. And Mukai....didn't she went out with the X Scar guy who happened to go to the same cram school? That's good enough for a suddenly appear character like Mukai.

Hmm...I myself don't really get that part too. But after a long thought, maybe she said that because even though people look at her(Nishino) as kind, cute(!) and calm teenage girl, she herself is a human, and each human have GREED. She's saluting Manaka perhaps someday she knew that she'll ask more...